Salmo schiefermuelleri is a designation for populations of trout in some subalpine lakes of Austria, whose taxonomical status is however unclear and which are suspected to be extinct.In their Handbook of European Freshwater Fishes (2007) and in the IUCN Red List, the ichthyologists Kottelat and Freyhof took up this name to refer to legendary fishes called Maiforelle that live in deep parts of Austrian lakes of the Danube basin and only appear in May to breed in shallow water.